Cu-base sintered alloy

ABSTRACT

The present invention relates to a Cu-based sintered alloy which has a composition containing: Zn: 10-40%; Al: 0.3%-6% oxygen: 0.03-1%; any one selected, as an additional element from the group including at least one of Fe, Ni and Co: 0.1-5%, Mn: 0.1-5%, Si: 0.1-3%, and at least one of W and Mo: 0.1-3%; and the remainder including Cu and inevitable impurities. The alloy is superior in wear resistance particularly in air at temperatures ranging from the ordinary temperature to 400° C., has high strength and high toughness, and further excels in the uniform temporal change characteristics with associated members, as evaluated by its friction coefficient. The invention relates also to parts for automotive equipment made of this Cu-base sintered alloy, such as synchronizer rings for transmission, valveguides for engines, bearings for turbo-chargers and so forth.

TECHNICAL FIELD

This invention relates to a Cu-based sintered alloy which excelsparticularly in wear resistance in air at temperatures ranging from theordinary temperature to 400° C., is of high strength and high toughness,and further has superior uniform temporal change characteristics withrespect to associated members, as measured by the coefficient offriction; and to parts for automotive equipment of this Cu-basedsintered alloy, such as synchronizer rings for transmissions, valveguides for engines, bearings for turbochargers, and the like.

BACKGROUND ART

Hitherto, for manufacture of the parts of the various automotiveequipment mentioned above, it has been proposed to use Cu-based sinteredalloy having the representative composition of Cu--28% Zn--6% Al byweight % (hereafter, the symbol % represents weight %).

The above conventional Cu-based alloy has superior uniform temporalchange chracteristics with respect to associated members because it is asintered one, but it does not possess sufficient wear resistance,strength and toughness. The alloy, therefore, cannot meet the designrequirements of compactness, light-weightness and increase of outputpower for the various equipment of recent years, and it has been keenlydesired to develop a Cu-based sintered alloy having better wearresistance, strength and toughness.

DISCLOSURE OF THE INVENTION

Therefore, in light of the facts described above, the present inventorshave directed their attention particularly to the above conventionalCu-based sintered alloy and have conducted research to develop aCu-based sintered alloy which possesses better wear resistance, strengthand toughness. As a result, they have learned that a certain Cu-basedsintered alloy has excellent wear resistance in air at temperaturesranging from the ordinary temperature to 400° C., high strength and hightoughness, and therefore, is usable for manufacturing parts which canmeet the design requirements of compactness, light-weightness andincrease of output power for the various equipment. The alloy has acomposition containing:

Zn 10-40%, Al: 0.3-6%, oxygen: 0.03-1%,

at least one additional element selected from the group including atleast one of Fe, Ni and Co: 0.1-5%; Mn: 0.1-5%; Si: 0.1-3%; and at leastone of W and Mo: 0.1-3%, and the remainder consisting of Cu andinevitable impurities. The sintered alloy has a structure wherein fineoxides including aluminum oxide (Al₂ O₃) as the main constituent andintermetallic compounds are uniformly dispersed in a matrix.

This invention has been carried out on the basis of the above knowledge.The Cu-based sintered alloy according to the invention, with the abovecomposition, comes to have a structure in the matrix of which the oxidesmainly consisting of Al₂ O₃ are distributed with a granule size rangingfrom 1 to 40 um so as to comprise 0.5-15% of surface area ratio. Theintermetallic compounds are distributed with a granule size from 1 to 25um and are uniformly dispersed comprising 1-10% of the surface arearatio. These oxides and intermetallic compounds cause the wearresistance to be remarkably improved, and particularly by the uniformdispersion of the oxides, the resistance to heat damage is improved inaddition to the improvement in the heat resistance of contactingsurfaces. Hence, the alloy of the present invention exhibits excellentwear resistance, even under high loads. Accordingly, the parts forautomotive equipment made of the above Cu-based sintered alloy excellikewise in wear resistance and so forth, and can sufficiently meet thedesign requirements of compactness, light-weightness and increase ofoutput power for the equipment.

Subsequently, description will be made concerning the reasons forlimiting the component constitution in the Cu-based sintered alloy ofthe invention as described above.

(a) Zn

The Zn component has the function of forming, together with Cu and Al,the matrix to enhance the strength and toughness of the alloy. When itscontent is less than 10%, however, the desired effect cannot beobtained. On the other hand, if its content exceeds 40%, a deterioratingphenomenon arises. Thus, its content is set to be 10-40%.

(b) Al

The Al component has, in addition to the function of forming, togetherwith Cu and Zn, the matrix of high strength and high toughness asdescribed above, the function of combining with oxygen to form an oxide,thereby improving the wear resistance under high temperature conditions,as well as at the ordinary temperature. When its content is less than0.3%, however, the desired effect cannot be obtained. On the other hand,if its content exceeds 6%, the toughness of the matrix becomes lower.Accordingly, its content is set at 0.3-6%.

(c) Oxygen

Oxygen has the function of combining with Al, as described above, andwith W, Mo and Cr, and further with Si, which are included as needed, toform oxides finely and uniformly dispersed in the matrix, therebyimproving the wear resistance, particularly under high load conditionsthrough improvement in resistance to heat damage and heat resistance.When its content is less than 0.03%, however, the formation of theoxides is too little so that the desired wear resistance cannot beensured. On the other hand, if its content is over 1%, not only do theoxides exceed 40 um in granule size, and thereby become coarse, but alsothey exceed 15% of surface area ratio to become too much, so that thestrength and toughness of the alloy is lowered and further, itsabrasiveness to adjacent members increases. Accordingly, its content isset at 0.03-1%.

(d) Fe, Ni and Co

These components have the function of dispersing in the matrix toenhance the strength and toughness of the alloy, and further, forming incombination with Cu and Al, fine intermetallic compounds dispersed inthe matrix to improve wear resistance. When its content is less than0.1%, however, the desired effect of the function cannot be obtained. Onthe other hand, if its content exceeds 5%, the toughness becomes lower.Thus, its content is set to be 0.1-5%.

(e) Mn

The Mn component has the function of forming, in combination with Si,the intermetallic compound finely dispersed in the matrix to enhancewear resistance, and partly making a solid solution in the matrix toenhance its strength. When its content is less than 0.1%, however, thedesired effect cannot be obtained. On the other hand, if its contentexceeds 5%, the toughness becomes lower. Accordingly, its content is setat 0.1-5%.

(f) Si

The Si component combines with Mn, W and Mo, and further with Cr whichis included as needed, to form the hard and fine intermetalliccompounds. Additionally, the Si component forms, in combination withoxygen, a complex oxide with Al, etc. to improve the wear resistance.Particularly by the existence of the complex oxide as described above,the resistance to heat damage and heat resistance at contacting surfacesare enhanced. The alloy, therefore, exhibits excellent wear resistance,for instance, even under high load conditions. When its content is lessthan 0.1%, however, the desired wear resistance cannot be ensured. Onthe other hand, if its content exceeds 3%, the toughness becomeslowered. For this reason, its content is set at 0.1-3%.

(g) W and Mo

These components have, in addition to the function of enhancing thestrength, the function of combining with Fe, Ni and Co, which areincluded as needed, to form the intermetallic compounds, and furthercombining with oxygen to form the fine oxides, thereby improving thewear resistance. When its content is less than 0.1%, however, thedesired strength and wear resistance cannot be ensured. On the otherhand, if its content is over 3%, the toughness becomes lowered. Thus,its content is set at 0.1-3%.

In the foregoing, it sometimes occurs that the Cu-based sintered alloyaccording to the invention includes P, Mg and Pb as inevitableimpurities. When the amount of these impurities is less than 1.5% intotal, however, the alloy characteristics do not deteriorate, so thattheir inclusion is permissible.

BEST MODE FOR CARRYING OUT THE INVENTION

The Cu-based sintered alloy of this invention has the composition asdescribed above, which includes Zn: 10-40%, Al: 0.3-6%, oxygen: 0.03-1%,at least one additional element selected from the group including atleast one of Fe, Ni and Co: 0.1-5%; Mn: 0.1-5%; Si: 0.1-3%; and at leastone of W and Mo: 0.1-3%, and the remainder consisting of Cu andinevitable impurities. Furthermore, it is preferable to replace a partof the above Cu as necessary with Sn: 0.1-4%; Mn: 0.1-5%; Si: 0.1-3%;one or more elements selected from the group including W, Mo and Cr:0.1-5%; or Cr: 0.1-3%. Hereinafter, the reasons why the above componentsare limited as above will be described.

(h) Sn

The Sn component has the function of making a solid solution in thematrix to strengthen the same and further heighten the resistance toheat damage under high load conditions, thereby contributing to theimprovement of the wear resistance. Therefore, the component is includedas necessary. When the content is less than 0.1%, however, the desiredeffect cannot be obtained. On the other hand, if the content exceeds 4%,the toughness becomes lower and, particularly, the heat resistance atcontacting surfaces is lowered, so that the wear resistancedeteriorates. Thus, its content is set at 0.1-4%.

(i) Mn

The Mn component has the function of making a solid solution in thematrix to heighten the strength, and therefore is included as necessaryeven when no Si is included. When its content is less than 0.1%, thedesired effect of heightening the strength cannot be obtained. On theother hand, if its content exceeds 5%, the toughness is lowered andfurther the heat resistance at contacting surfaces becomes lower, sothat the desired wear resistance cannot be ensured. Thus, its content isset at 0.1-5%.

(j) W, Mo and Cr

These components have the function of combining with Fe, Ni and Co toform the fine intermetallic compounds, and further combining with oxygento form the fine oxides, thereby improving the wear resistance. Thecomponents, therefore, are included as occasion demands. When thecontent is less than 0.1%, the desired effect cannot be obtained inheightening wear resistance. On the other hand, if the content exceeds5%, the toughness becomes lower. Accordingly, their content is set at0.1-5%.

(k) Cr The Cr component has the function of forming, in combination withiron family metals which are included as necessary as in the case of Wand Mo, the intermetallic compounds and further the oxides to improvethe wear resistance. For this reason, Cr is included as necessary. Whenthe content is less than 0.1%, the desired effect cannot be obtained inthe wear resistance. On the other hand, if its content exceeds 3%, thetoughness becomes lower. Thus, its content is set to be 0.1-3%.

EXAMPLES

Hereinafter, the Cu-based sintered alloy according to the invention willbe concretely described through the examples thereof.

EXAMPLE 1

Prepared as starting material powders were two varieties each of Cu-Alalloy (Al: 50% included) powders, Cu powders, Zn powders, Al powders, Fepowders, Ni powders, Co powders, Mn powders, W powders, Mo powders, Crpowders, and Sn powders. Each of these powders is of particle size lessthan 200 mesh, and the two varieties of the same sort of powders aremade to have O₂ contents of 4% and 1%, respectively, by adjustment ofthe thicknesses of oxidized surface layers. These starting materialpowders were blended into the compositions shown in TABLES 1-1 to 1-3,and wet pulverized and mixed together for 72 hours in a ball mill. Themixtures after having been dried were pressed into green compacts undera predetermined pressure within the range of 4-6 ton/cm². Then, thegreen compacts were sintered in an atmosphere of H₂ gas, which has thedew point: 0°-30° C., at a predetermined temperature within the range of800°-900° C. for one and half hours to produce Cu-based sintered alloys1-36 according to the present invention, comparative Cu-based sinteredalloys 1-6, and the Cu-based sintered alloys according to theconventional art. The alloys had the sizes of outer diameter: 75mm×inner diameter: 65 mm×thickness: 8.5 mm for measurement of pressuredestructive forces, of width: 10 mm×thickness: 10 mm×length: 40 mm forwearing tests, and of outer diameter: 10 mm×height: 20 mm formeasurement of friction coefficients, respectively, and each of thealloys had substantially the same component composition as the blendedcomposition.

In the foregoing, Cu-based sintered alloys 1-36 according to theinvention had the structures wherein the oxides and intermetalliccompounds were uniformly dispersed in the matrices.

Each of the comparative Cu-based sintered alloys 1-6 deviated from therange of the invention in the content of any one of its constituentcomponents (the component marked with in TABLE 1).

Subsequently, with respect to the various kinds of the Cu-based sinteredalloys obtained in consequence of the above, pressure destructive forceswere measured for the purpose of evaluation of strength and toughness.Furthermore, for the purpose of evaluation of wear resistance,block-on-ring tests were conducted to measure specific wear amountsunder the conditions of:

shape of test piece: 8 mm×8 mm×30 mm;

associated member: hardened ring of SCr 420 material sized to diameter:30 mm×width: 5 mm;

oil: 65 W gear oil;

oil temperature: 50° C.;

Sliding speed: 2 m/sec.;

final load: 3 Kg; and,

sliding distance: 1.5 Km.

Moreover, for the purpose of evaluation of the uniform temporal changeproperties with respect to associated members, pin-wearing tests wereconducted to calculate friction coefficients from a torque meter underthe conditions of:

shape of test piece: pin having diameter of 3 mm;

associated member: hardened disk of SCr 420 material;

oil: 65 W gear oil;

oil temperature: 50° C.;

sliding speed: 4 m/sec.;

pressing force: 1.5 Kg; and,

sliding distance: 1.5 Km.

The results of these tests are shown in TABLES 1-1 to 1-3.

EXAMPLE 2

Prepared as starting material powders were two varieties each of Cu-Alalloy (Al: 50% included) powders, Cu powders, Zn powders, Al powders, Sipowders, W powders, Mo powders, Fe powders, Ni powders, Co powders, Crpowders, and Sn powders. Each of these powders is of particle size lessthan 200 mesh, and the two varieties of the same sort of powders aremade to have O₂ contents of 4% and 1%, respectively, by adjustment ofthe thicknesses of oxidized surface layers. These starting materialpowders were blended into the compositions shown in TABLES 2-1 and 2-2.The powders thus blended were pulverized and mixed together, andsintered after having been dried and pressed into green compacts in thesame manner as in the case of Example 1 to produce Cu-based sinteredalloys 1-30 according to the present invention, comparative Cu-basedsintered alloys 1-7, and the Cu-based sintered alloys according to theconventional art. The alloys had the sizes of outer diameter 72 mm×innerdiameter: 62 mm×thickness: 8.2 mm for measurement of pressuredestructive forces, of width: 10 mm×thickness: 10 mm×length: 40 mm forwearing tests, and of outer diameter: 10 mm×height: 20 mm formeasurement of friction coefficients, respectively, and each of thealloys had substantially the same component composition as the blendedcomposition.

In the foregoing, Cu-based sintered alloys 1-30 according to theinvention had structures wherein the oxides and intermetallic compoundswere uniformly dispersed in the matrices.

Each of the comparative Cu-based sintered alloys 1-7 deviated from therange of the invention in the content of any one of its constituentcomponents (the component marked with in TABLE 2).

Subsequently, with respect to the various kinds of the Cu-based sinteredalloys obtained in consequence of the above, pressure destructive forceswere measured for the purpose of evaluation of strength and toughness.Furthermore, for the purpose of evaluation of wear resistance,block-on-ring tests were conducted to measure specific wear amountsunder the conditions of:

shape of test piece: 8 mm×8 mm×30 mm;

associated member: ring of S45C material sized to diameter: 30 mm×width:5 mm;

oil: 20 W gear oil;

oil temperature: 75° C.;

sliding speed: 6 m/sec.;

final load: 4 Kg; and,

sliding distance: 1.5 Km.

Moreover, for the purpose of evaluation of the uniform temporal changecharacteristices with respect to associated members, pin-wearing testswere conducted to calculate friction coefficients from a torque meterunder the conditions of:

shape of test piece: pin having diameter of 3 mm;

associated member: disk of S45C material;

oil: 20 W engine oil;

oil temperature: 75° C.;

sliding speed: 6 m/sec.;

pressing force: 2 Kg; and,

sliding distance: 1.5 Km.

The results of these tests are shown in TABLES 2-1 to 2-3.

EXAMPLE 3

Prepared as starting material powders were two varieties each of Cu-Alalloy (Al: 50% included) powders, Cu powders, Zn powders, Al powders, Mnpowders, Si powders, Fe powders, Ni powders, Co powders, and Cr powders.Each of these powders is of particle size less than 200 mesh, and thetwo varieties of the same sort of powders are made to have O₂ contentsof 4% and 2%, respectively, by adjustment of the thicknesses of oxidizedsurface layers. These starting material powders were blended into thecompositions shown in TABLES 3-1 and 3-2. The powders thus blended werepulverized and mixed together, and sintered after having been dried andpress-molded into green compacts in the same manner as in the case ofExample 1 to produce Cu-based sintered alloys 1-17 according to thepresent invention, comparative Cu-based sintered alloys 1-7, and thecu-based sintered alloys according to the conventional art. The alloyshad the sizes of outer diameter: 71 mm×inner diameter: 63 mm×thickness:8 mm for measurement of pressure destructive forces, of width: 10mm×thickness: 10 mm×length: 40 mm for wearing tests, and of outerdiameter: 10 mm×height: 20 mm for measurement of friction coefficients,respectively, and each of the alloys had substantially the samecomponent composition as the blended composition.

In the foregoing, Cu-based sintered alloys 1-17 according to theinvention had the structures wherein the oxides and intermetalliccompounds were uniformly dispersed in the matrices.

Each of the comparative Cu-based sintered alloys 1-7 deviated from therange of the invention in the content of any one of its constituentcomponents (the component marked with TABLE 3).

Subsequently, with respect to the various kinds of the Cu-based sinteredalloys obtained in consequence of the above, pressure destructive forceswere measured for the purpose of evaluation of strength and toughness.Furthermore, for the purpose of evaluation of wear resistance,block-on-ring tests were conducted to measure specific wear amountsunder the conditions of:

shape of test piece: 8 mm×8 mm×30 mm;

associated member: ring of S35C material sized to diameter: 30 mm×width:5 mm;

oil: 10 W engine oil;

oil temperature: 85° C.;

sliding speed: 10 m/sec.;

final load: 4 Kg; and,

sliding distance: 1.5 Km.

Moreover, for the purpose of evaluation of the uniform temporal changecharacteristics with respect to associated members, pin-wearing testswere conducted to calculate friction coefficients from a torque meterunder the conditions of:

shape of test piece: pin having diameter of 2.5 mm;

associated member: disk of S35C material;

oil: 10 W engine oil;

oil temperature: 85° C.;

sliding speed: 10 m/sec.;

pressing force: 2 Kg; and,

sliding distance: 1.5 Km.

The results of these tests are shown in TABLES 3-1 to 3-3.

EXAMPLE 4

Prepared as starting material powders were two varieties each of Cu-Alalloy (Al: 50% included) powders, Cu powders, Zn powders, Al powders, Mnpowders, Si powders, W powders, Mo powders, Fe powders, Ni powders, Copowders, Cr powders, and Sn powders. Each of these powders is ofparticle size less than 200 mesh, and the two varieties of the same sortof powders are made to have O₂ contents of 4% and 2%, respectively, byadjustment of the thicknesses of oxidized surface layers. These startingmaterial powders were blended into the compositions shown in TABLES 4-1and 4-2. 2. The powders thus blended were pulverized and mixed together,and sintered after having been dried and pressed into green compacts inthe same manner as in the case of Example 1 to produce Cu-based sinteredalloys 1-30 according to the present invention, comparative Cu-basedsintered alloys 1-6, and the Cu-based sintered alloys according to theconventional art. The alloys had the sizes of outer diameter: 70mm×inner diameter: 62 mm×thickness: 8 mm for measurement of pressuredestructive forces, of width: 10 mm×thickness: 10 mm×length: 40 mm forwearing tests, and of outer diameter: 10 mm×height: 20 mm formeasurement of friction coefficients, respectively, and each of thealloys had substantially the same composition as the blendedcomposition.

In the foregoing, Cu-based sintered alloys 1-30 according to theinvention had the structures wherein the oxides and intermetalliccompounds were uniformly dispersed in the matrices.

Each of the comparative Cu-based sintered alloys 1-6 deviated from therange of the invention in the content of any one of its constituentcomponents (the component marked with in TABLE 4).

Subsequently, with respect to the various kinds of the Cu-based sinteredalloys obtained in consequence of the above, pressure destructive forceswere measured for the purpose of evaluation of strength and toughness.Furthermore, for the purpose of evaluation of wear resistance,block-on-ring tests were conducted to measure specific wear amountsunder the conditions of:

shape of test piece: 8 mm×8 mm×30 mm;

associated member: ring of SUH36 material sized to diameter: 30mm×width: 5 mm;

oil: 5 W engine oil;

oil temperature: 80° C.;

sliding speed: 8 m/sec.;

final load: 5 Kg; and,

sliding distance: 1.5 Km.

Moreover, for the purpose of evaluation of the complementarycharacteristics with associated members, pin-wearing tests wereconducted to calculate friction coefficients from a torque meter underthe conditions of:

shape of test piece: pin having diameter of 2 mm;

associated member: disk of SUH36 material;

oil: 5 W engine oil;

oil temperature: 80° C.;

sliding speed: 8 m/sec.;

pressing force: 2 Kg; and,

sliding distance: 1.5 Km.

The results of these tests are shown in TABLES 4-1 to 4-3.

From the results shown in TABLE 1-TABLE 4, the following is apparent.The Cu-based sintered alloys according to the present invention havefriction coefficients which are equivalent to those of the conventionalCu-based sintered alloys. This means that they are excellent in regardto uniform temporal change characteristics with respect to associatedmembers. Also, they have superior wear resistance, strength andtoughness as compared with the conventional Cu-based sintered alloys. Incontrast, as seen in the comparative Cu-based sintered alloys, if thecontent of even any one of the constituent components is out of therange of the present invention, at least one property of the wearresistance, the strength and the toughness tends to deteriorate.Accordingly, with the parts for various automotive equipment made of theCu-based sintered alloy of the invention, such as synchronizer rings fortransmissions, etc., excellent wear resistance and so forth areexhibited and the design requirements of compactness, light-weightnessand increase in output power of the equipment can be sufficiently met.

INDUSTRIAL APPLICABILITY

The Cu-based sintered alloy according to the invention has excellentwear resistance, has high strength and high toughness, and is superiorin uniform temporal change characteristic with respect to associatedmembers Therefore, with the parts for various automotive equipment madeof this Cu-based sintered alloy, such as valve-guides, bearings forturbo-chargers and the like, the applicability useful in industry can beprovided such that superior wear resistance and so forth are exhibitedin air at temperatures ranging from the ordinary temperature to 400° C.,the design requirements of compactness, light-weightness and increase inoutput power of the equipment can be sufficiently met, and further theexcellent performance can be exhibited for a long period of time whenput into practical use.

                                      TABLE 1                                     __________________________________________________________________________                                               PRESSURE                                                                             SPECIFIC                                                                              FRIC-                                                          DESTRUC-                                                                             WEAR    TION                BLENDED COMPOSITION (wt %)                 TIVE   AMOUNT  COEF-                                  OXY-            Cu +    LOAD   (×10.sup.-7                                                             mm.sup.2 /                                                                            FI-                 TYPE                                                                              Zn Al Fe Ni Co GEN Mn Sn                                                                              W Mo Cr                                                                              IMPURITY                                                                              (Kg)   Kg · m)                                                                      CIENT               __________________________________________________________________________    Cu-BASED SINTERED ALLOY ACCORDING TO INVENTION                                 1  10 3  2  1  -- 0.4 -- --                                                                              --                                                                              -- --                                                                              REMAINDER                                                                              80    15      0.08                 2  20 2.5                                                                              -- -- 3  0.2 -- --                                                                              --                                                                              -- --                                                                              REMAINDER                                                                              95    16      0.07                 3  30 2.5                                                                              1  1  1  0.2 -- --                                                                              --                                                                              -- --                                                                              REMAINDER                                                                             110    16      0.07                 4  40 3  1  -- 4  0.3 -- --                                                                              --                                                                              -- --                                                                              REMAINDER                                                                             130    12      0.08                 5  32 0.3                                                                              -- 5  -- 0.1 -- --                                                                              --                                                                              -- --                                                                              REMAINDER                                                                              95    25      0.06                 6  26 6  0.1                                                                              -- 0.1                                                                              0.9 -- --                                                                              --                                                                              -- --                                                                              REMAINDER                                                                             100    13      0.09                 7  30 3  -- -- 0.1                                                                              0.3 -- --                                                                              --                                                                              -- --                                                                              REMAINDER                                                                             105    21      0.08                 8  31 3.5                                                                              -- 0.1                                                                              -- 0.4 -- --                                                                              --                                                                              -- --                                                                              REMAINDER                                                                             105    20      0.07                 9  28 2.8                                                                              5  -- -- 0.3 -- --                                                                              --                                                                              -- --                                                                              REMAINDER                                                                             120    11      0.08                10  30 1.0                                                                              2.5                                                                              -- -- 0.03                                                                              -- --                                                                              --                                                                              -- --                                                                              REMAINDER                                                                             105    28      0.06                11  33 3  1  1  1  1   -- --                                                                              --                                                                              -- --                                                                              REMAINDER                                                                             100    14      0.09                12  13 1.5                                                                              2  2  1  0.2 0.1                                                                              --                                                                              --                                                                              -- --                                                                              REMAINDER                                                                              80    20      0.08                13  38 2.5                                                                              -- 3  -- 0.3 2  --                                                                              --                                                                              -- --                                                                              REMAINDER                                                                             110    15      0.09                14  25 3  1  -- 2  0.3 5  --                                                                              --                                                                              -- --                                                                              REMAINDER                                                                             100    14      0.09                15  39 5.8                                                                              4  1  -- 0.8 -- 0.1                                                                             --                                                                              -- --                                                                              REMAINDER                                                                             125     9      0.09                16  30 3  1  -- -- 0.4 -- 2 --                                                                              -- --                                                                              REMAINDER                                                                             100    19      0.09                17  27 2  -- 0.3                                                                              -- 0.3 -- 4 --                                                                              -- --                                                                              REMAINDER                                                                              95    23      0.09                18  30 2.5                                                                              -- -- 4  0.3 -- --                                                                              0.1                                                                             -- --                                                                              REMAINDER                                                                             110    14      0.07                19  28 3.1                                                                              2  1  -- 0.9 -- --                                                                              5 -- --                                                                              REMAINDER                                                                              95     5      0.09                20  30 2  1  2  -- 0.08                                                                              -- --                                                                              --                                                                              0.1                                                                              --                                                                              REMAINDER                                                                             115    16      0.06                21  38 0.5                                                                              0.5                                                                              -- -- 0.1 -- --                                                                              --                                                                              5  --                                                                              REMAINDER                                                                              85    13      0.07                22  14 5.8                                                                              3  2  -- 0.5 -- --                                                                              --                                                                              -- 0.1                                                                             REMAINDER                                                                              95     8      0.09                23  25 3  1  1  1  0.9 -- --                                                                              --                                                                              -- 5 REMAINDER                                                                              95     4      0.09                24  30 3  2  1  1  0.6 -- --                                                                              2 1  --                                                                              REMAINDER                                                                             105     6      0.09                25  28 3  1.5                                                                              1  -- 0.4 -- --                                                                              1 1  1 REMAINDER                                                                              95     7      0.08                26  30 2  -- 2  1  0.3 1  1 --                                                                              -- --                                                                              REMAINDER                                                                             110    10      0.08                27  30 3  2  -- -- 0.3 0.5                                                                              --                                                                              1 -- --                                                                              REMAINDER                                                                             110    14      0.08                28  30 2.5                                                                              1  1  -- 0.4 3  --                                                                              --                                                                              0.5                                                                              0.5                                                                             REMAINDER                                                                             105    10      0.08                29  29 3  -- 2  -- 0.07                                                                              1  --                                                                              0.5                                                                             1  1 REMAINDER                                                                             105    10      0.07                30  27 3  -- 2  1  0.2 -- 0.5                                                                             --                                                                              3  --                                                                              REMAINDER                                                                             110     8      0.08                31  25 4  2  2  1  0.4 -- 1 2 2  1 REMAINDER                                                                             115     7      0.08                32  32 3  1  1  -- 0.3 -- 4 --                                                                              -- 3 REMAINDER                                                                             105     6      0.09                33  30 3  0.5                                                                              0.5                                                                              0.5                                                                              0.2 0.5                                                                              1 --                                                                              1  --                                                                              REMAINDER                                                                             110    14      0.08                34  28 2.5                                                                              -- 1.5                                                                              1.5                                                                              0.1 1  1 --                                                                              1  2 REMAINDER                                                                             105    10      0.07                35  30 2.5                                                                              1.5                                                                              1.5                                                                              1.5                                                                              0.5 5  0.5                                                                             1 2  --                                                                              REMAINDER                                                                             110     8      0.08                36  30 3  2  1  -- 0.4 3  2 1 1  1 REMAINDER                                                                             100    11      0.09                COMPARATIVE Cu-BASED SINTERED ALLOY                                            1   8*                                                                              3  2.5                                                                              -- -- 0.3 -- --                                                                              --                                                                              -- --                                                                              REMAINDER                                                                              45    42      0.05                 2  43*                                                                              3  -- 2.5                                                                              -- 0.4 -- --                                                                              --                                                                              -- --                                                                              REMAINDER                                                                              50    39      0.04                 3  30 --*                                                                              1.5                                                                              1  1  0.05                                                                              -- --                                                                              --                                                                              -- --                                                                              REMAINDER                                                                              40    55      HEAT                                                                          DAM-                                                                          AGE                  4  30 3  --*                                                                              --*                                                                              --*                                                                              0.3 -- --                                                                              --                                                                              -- --                                                                              REMAINDER                                                                              60    50      0.08                 5  25 3  -- 2  -- --* -- --                                                                              --                                                                              -- --                                                                              REMAINDER                                                                             105    48      HEAT                                                                          DAM-                                                                          AGE                  6  30 2.5                                                                              2.5                                                                              -- -- --  1.3*                                                                             --                                                                              --                                                                              -- --                                                                              REMAINDER                                                                              40    30      0.06                CONVENTIONAL Cu-BASED SINTERED ALLOY                                          28     6  -- -- -- --  -- --                                                                              --                                                                              -- --                                                                              REMAINDER                                                                              32    68      0.07                __________________________________________________________________________     (*OUT OF RANGE OF INVENTION)                                             

                                      TABLE 2                                     __________________________________________________________________________                                                PRESSURE                                                                             SPECIFIC                                                                             FRIC-                                                           DESTRUC-                                                                             WEAR   TION                BLENDED COMPOSITION (wt %)                  TIVE   AMOUNT COEF-                                           OXY-    Cu +    LOAD   (×10.sup.-7                                                             mm.sup.2 /                                                                           FI-                 TYPE                                                                              Zn Al Si W  Mo Fe Ni Co GEN Sn                                                                              Cr                                                                              IMPURITY                                                                              (Kg)   Kg · m)                                                                     CIENT               __________________________________________________________________________    Cu-BASED SINTERED ALLOY ACCORDING TO INVENTION                                 1  10 3  1.5                                                                              2  -- -- -- 3  0.4 --                                                                              --                                                                              REMAINDER                                                                              80    17     0.07                 2  20 3  1.5                                                                              -- 1.5                                                                              1  1  -- 0.3 --                                                                              --                                                                              REMAINDER                                                                              95    18     0.06                 3  30 3  1.5                                                                              1  1  -- 5  -- 0.3 --                                                                              --                                                                              REMAINDER                                                                             120    16     0.06                 4  40 2.5                                                                              2  -- 2  3  -- -- 0.5 --                                                                              --                                                                              REMAINDER                                                                             125    17     0.07                 5  25 0.3                                                                              2  0.5                                                                              0.5                                                                              1  1  3  0.1 --                                                                              --                                                                              REMAINDER                                                                             100    25     0.05                 6  30 6  1.5                                                                              -- 1  1  -- 1  0.9 --                                                                              --                                                                              REMAINDER                                                                             105    13     0.08                 7  30 2.5                                                                              0.1                                                                              0.5                                                                              -- -- 2  1  0.3 --                                                                              --                                                                              REMAINDER                                                                              90    17     0.06                 8  25 3  3  -- 1  -- -- 5  0.4 --                                                                              --                                                                              REMAINDER                                                                             115    10     0.07                 9  30 2.5                                                                              1.5                                                                              0.1                                                                              -- 0.5                                                                              0.5                                                                              -- 0.3 --                                                                              --                                                                              REMAINDER                                                                              95    20     0.06                10  30 2  2  -- 0.1                                                                              -- 1  1  0.4 --                                                                              --                                                                              REMAINDER                                                                             100    19     0.06                11  25 3  2.5                                                                              3  -- 2  -- 1  0.4 --                                                                              --                                                                              REMAINDER                                                                             105    10     0.06                12  20 5.5                                                                              2.5                                                                              -- 3  -- 0.5                                                                              1  0.6 --                                                                              --                                                                              REMAINDER                                                                             110     9     0.07                13  35 1  0.5                                                                              1  1  5  -- -- 0.1 --                                                                              --                                                                              REMAINDER                                                                             100    18     0.05                14  30 3  0.5                                                                              2  -- -- 0.1                                                                              -- 0.3 --                                                                              --                                                                              REMAINDER                                                                             110    21     0.06                15  40 6  3  -- 2  -- -- 0.1                                                                              0.9 --                                                                              --                                                                              REMAINDER                                                                             120    19     0.08                16  25 0.5                                                                              0.2                                                                              0.1                                                                              0.1                                                                              -- -- 1  0.03                                                                              --                                                                              --                                                                              REMAINDER                                                                             100    22     0.06                17  25 4  3  2  0.5                                                                              1  1  1  1   --                                                                              --                                                                              REMAINDER                                                                              90    10     0.08                18  30 2  2  1  1  1  1  1  0.4 0.1                                                                             --                                                                              REMAINDER                                                                             105    14     0.06                19  35 1.5                                                                              2  -- 2  1  -- -- 0.2 1 --                                                                              REMAINDER                                                                             100    12     0.06                20  20 5  1.5                                                                              -- 0.5                                                                              1  -- -- 0.6 2 --                                                                              REMAINDER                                                                             110    11     0.07                21  30 3  0.5                                                                              2  -- 1  3  1  0.3 3 --                                                                              REMAINDER                                                                             115     9     0.06                22  30 1  1.5                                                                              1  1  2  1  1  0.1 4 --                                                                              REMAINDER                                                                              95     9     0.05                23  20 2.5                                                                              2  -- 1.5                                                                              2  -- 1  0.3 --                                                                              0.1                                                                             REMAINDER                                                                              95    18     0.06                24  20 1  2  1.5                                                                              -- -- 2  -- 0.5 --                                                                              1 REMAINDER                                                                              90    15     0.07                25  25 3  1.5                                                                              2  -- 1  1  1  0.7 --                                                                              2 REMAINDER                                                                             100    12     0.07                26  25 1.5                                                                              1  -- 2  1  1  3  0.6 --                                                                              3 REMAINDER                                                                              95     9     0.08                27  35 2  2.5                                                                              1.5                                                                              1  -- 2  1  0.3 0.5                                                                             0.5                                                                             REMAINDER                                                                             110    13     0.06                28  35 1.5                                                                              2  1  -- 3  -- -- 0.4 2 0.1                                                                             REMAINDER                                                                             105    14     0.06                29  25 1.5                                                                              1  0.5                                                                              2  1  -- 0.5                                                                              0.4 0.1                                                                             2 REMAINDER                                                                             100    10     0.06                30  30 1  1.5                                                                              1.5                                                                              1  1  -- 0.5                                                                              0.3 4 1 REMAINDER                                                                              95     9     0.07                COMPARATIVE Cu-BASED SINTERED ALLOY                                            1   7*                                                                              3  1.5                                                                              1  2.5                                                                              2  1  1  0.4 --                                                                              --                                                                              REMAINDER                                                                              50    41     0.04                 2  25 --*                                                                              1.5                                                                              -- 3  1.5                                                                              1  1  0.1 --                                                                              --                                                                              REMAINDER                                                                              45    58     HEAT                                                                          DAM-                                                                          AGE                  3  25 2.5                                                                              --*                                                                              -- 3  1  1  1  0.3 --                                                                              --                                                                              REMAINDER                                                                              95    47     0.05                 4  30 3  2  --*                                                                              --*                                                                              1  1  1  0.4 --                                                                              --                                                                              REMAINDER                                                                             100    50     0.06                 5  25 3  1.5                                                                              1  2.5                                                                              --*                                                                              --*                                                                              --*                                                                              0.4 --                                                                              --                                                                              REMAINDER                                                                              65    48     0.08                 6  30 2.5                                                                              1.5                                                                              2  1  1  1  2  --* --                                                                              --                                                                              REMAINDER                                                                             110    49     HEAT                                                                          DAM-                                                                          AGE                  7  30 2.5                                                                              1.5                                                                              2  1  1  1  1  1.2*                                                                              --                                                                              --                                                                              REMAINDER                                                                              45    27     0.04                CONVENTIONAL Cu-BASED SINTERED ALLOY                                          28     6  -- -- -- -- -- -- --  --                                                                              --                                                                              REMAINDER                                                                              40    64     0.06                __________________________________________________________________________     (*OUT OF RANGE OF INVENTION)                                             

                                      TABLE 3                                     __________________________________________________________________________                                           PRESSURE                                                                             SPECIFIC                                                               DESTRUC-                                                                             WEAR                            BLENDED COMPOSITION (wt %)             TIVE   AMOUNT                                                   OXY-  Cu +    LOAD   (×10.sup.-7 mm.sup.2                                                    /      FRICTION                 TYPE                                                                              Zn Al Mn Si Fe Ni Co GEN Cr                                                                              IMPURITY                                                                              (Kg)   Kg · m)                                                                     COEFFICIENT              __________________________________________________________________________    Cu-BASED SINTERED ALLOY ACCORDING TO INVENTION                                 1  10 3  2.5                                                                              1.5                                                                              -- 3  -- 0.4 --                                                                              REMAINDER                                                                              90    17     0.07                      2  20 2.5                                                                              2.5                                                                              2  -- 0.5                                                                              0.5                                                                              0.3 --                                                                              REMAINDER                                                                             100    19     0.07                      3  30 2.5                                                                              3  2  2  -- -- 0.3 --                                                                              REMAINDER                                                                             120    18     0.06                      4  40 3  2  1.5                                                                              -- 1  4  0.4 --                                                                              REMAINDER                                                                             130    15     0.07                      5  30 0.3                                                                              2.5                                                                              1.5                                                                              -- 3  -- 0.1 --                                                                              REMAINDER                                                                             100    24     0.06                      6  25 6  2  2  0.5                                                                              2.5                                                                              -- 0.9 --                                                                              REMAINDER                                                                             120    13     0.08                      7  35 5  0.1                                                                              2.5                                                                              -- -- 5  0.8 --                                                                              REMAINDER                                                                             120    17     0.08                      8  20 3.5                                                                              5  1.5                                                                              1  1  1  0.4 --                                                                              REMAINDER                                                                             115     8     0.07                      9  30 2.5                                                                              1.5                                                                              0.1                                                                              -- 2  2  0.3 --                                                                              REMAINDER                                                                             120    17     0.06                     10  25 2  2.5                                                                              3  1  -- 3  0.4 --                                                                              REMAINDER                                                                             110    10     0.07                     11  30 1.5                                                                              4  1  0.1                                                                              -- -- 1   --                                                                              REMAINDER                                                                             100    19     0.08                     12  25 3  0.5                                                                              1.5                                                                              -- 0.1                                                                              -- 0.03                                                                              --                                                                              REMAINDER                                                                             105    22     0.05                     13  25 1.5                                                                              3  1  -- -- 0.1                                                                              0.4 --                                                                              REMAINDER                                                                             105    19     0.07                     14  30 2  2.5                                                                              2.5                                                                              1  3  1  0.3 --                                                                              REMAINDER                                                                             120    15     0.07                     15  35 1.5                                                                              3  0.5                                                                              -- 3  -- 0.1 0.3                                                                             REMAINDER                                                                             120    13     0.06                     16  30 2.5                                                                              2.5                                                                              1.5                                                                              -- 2  -- 0.4 1.5                                                                             REMAINDER                                                                             120    10     0.06                     17  25 1.5                                                                              1  1.5                                                                              1  2  1  0.8 3 REMAINDER                                                                             115     7     0.08                     COMPARATIVE Cu-BASED SINTERED ALLOY                                            1   8*                                                                              3   2.5                                                                             1.5                                                                              -- 3  -- 0.4 --                                                                              REMAINDER                                                                              50    83     0.04                      2  30 0.1*                                                                             2.5                                                                              1  1  1  1  0.4 --                                                                              REMAINDER                                                                              45    88     HEAT DAMAGE               3  25 2.5                                                                              --*                                                                              1  4  -- -- 0.3 --                                                                              REMAINDER                                                                              95    51     0.04                      4  30 2  2.5                                                                              --*                                                                              -- -- 3  0.3 --                                                                              REMAINDER                                                                              90    62     0.04                      5  25 1.5                                                                              3  1.5                                                                              --*                                                                              --*                                                                              --*                                                                              0.5 --                                                                              REMAINDER                                                                              80    45     0.05                      6  30 3  1.5                                                                              2  0.05                                                                             0.1                                                                              -- 0.014*                                                                            --                                                                              REMAINDER                                                                              90    92     HEAT DAMAGE               7  25 3  2.5                                                                              2  -- 1  -- 1.26*                                                                             --                                                                              REMAINDER                                                                              55    31     0.05                     CONVENTIONAL Cu-BASED SINTERED ALLOY                                          25     4  -- -- -- -- -- --  --                                                                              REMAINDER                                                                              35    93     0.05                     __________________________________________________________________________     (*OUT OF RANGE OF INVENTION)                                             

                                      TABLE 4                                     __________________________________________________________________________                                               PRESSURE                                                                             SPECIFIC                                                               DESTRUC-                                                                             WEAR   FRIC-                BLENDED COMPOSITION (wt %)                 TIVE   AMOUNT TION                                      OXY-          Cu +    LOAD   (×10.sup.-7                                                             mm.sup.2 /                                                                           COEF-                TYPE                                                                              Zn Al                                                                              Mn Si W  Mo GEN Fe                                                                              Ni                                                                              Co                                                                              Sn                                                                              Cr                                                                              IMPURITY                                                                              (Kg)   Kg · m)                                                                     FICIENT              __________________________________________________________________________    Cu-BASED SINTERED ALLOY ACCORDING TO INVENTION                                 1  10 3 2.5                                                                              1.5                                                                              1  -- 0.4 --                                                                              --                                                                              --                                                                              --                                                                              --                                                                              REMAINDER                                                                              85    16     0.07                  2  20 3 2.5                                                                              1.5                                                                              -- 0.5                                                                              0.3 --                                                                              --                                                                              --                                                                              --                                                                              --                                                                              REMAINDER                                                                              95    18     0.07                  3  30 2.5                                                                             3  1  1  1  0.4 --                                                                              --                                                                              --                                                                              --                                                                              --                                                                              REMAINDER                                                                             115    15     0.06                  4  40 2.5                                                                             2  2  -- 1  0.4 --                                                                              --                                                                              --                                                                              --                                                                              --                                                                              REMAINDER                                                                             125    16     0.07                  5  25 0.3                                                                             3  1.5                                                                              2  -- 0.1 --                                                                              --                                                                              --                                                                              --                                                                              --                                                                              REMAINDER                                                                              95    23     0.06                  6  30 6 2.5                                                                              1  -- 3  0.9 --                                                                              --                                                                              --                                                                              --                                                                              --                                                                              REMAINDER                                                                             110    12     0.08                  7  30 2.5                                                                             0.1                                                                              1.5                                                                              0.5                                                                              0.5                                                                              0.4 --                                                                              --                                                                              --                                                                              --                                                                              --                                                                              REMAINDER                                                                              90    16     0.07                  8  25 3 5  1.5                                                                              3  -- 0.3 --                                                                              --                                                                              --                                                                              --                                                                              --                                                                              REMAINDER                                                                             115     8     0.07                  9  30 2.5                                                                             3  0.1                                                                              1  -- 0.3 --                                                                              --                                                                              --                                                                              --                                                                              --                                                                              REMAINDER                                                                              95    18     0.06                 10  30 2 3  3  -- 2  0.4 --                                                                              --                                                                              --                                                                              --                                                                              --                                                                              REMAINDER                                                                             120    10     0.06                 11  25 3 2.5                                                                              1.5                                                                              0.1                                                                              -- 0.3 --                                                                              --                                                                              --                                                                              --                                                                              --                                                                              REMAINDER                                                                             105    19     0.06                 12  20 5 2.5                                                                              1  -- 0.1                                                                              0.6 --                                                                              --                                                                              --                                                                              --                                                                              --                                                                              REMAINDER                                                                             100    17     0.07                 13  30 1 0.5                                                                              0.5                                                                              -- 1  0.03                                                                              --                                                                              --                                                                              --                                                                              --                                                                              --                                                                              REMAINDER                                                                              95    20     0.05                 14  25 3.5                                                                             1.5                                                                              1  3  -- 1   --                                                                              --                                                                              --                                                                              --                                                                              --                                                                              REMAINDER                                                                             110     9     0.08                 15  40 5.5                                                                             4.5                                                                              2.5                                                                              2  1  0.8 3 --                                                                              --                                                                              --                                                                              --                                                                              REMAINDER                                                                             115     7     0.08                 16  25 0.5                                                                             0.3                                                                              0.3                                                                              -- 0.2                                                                              0.1 --                                                                              1 --                                                                              --                                                                              --                                                                              REMAINDER                                                                             105    21     0.06                 17  25 3.5                                                                             2.5                                                                              3  0.5                                                                              3  0.3 --                                                                              --                                                                              0.1                                                                             --                                                                              --                                                                              REMAINDER                                                                              95    15     0.08                 18  30 2 3  2.5                                                                              2  -- 0.3 3 2 --                                                                              --                                                                              --                                                                              REMAINDER                                                                             105    10     0.06                 19  30 2 2  1  1.5                                                                              2  0.4 --                                                                              --                                                                              --                                                                              0.1                                                                             --                                                                              REMAINDER                                                                             105    14     0.07                 20  25 4.5                                                                             3  1  1  -- 0.5 --                                                                              --                                                                              --                                                                              3 --                                                                              REMAINDER                                                                             120    11     0.07                 21  30 3 1  0.5                                                                              -- 3  0.3 --                                                                              --                                                                              --                                                                              --                                                                              0.1                                                                             REMAINDER                                                                             100    17     0.06                 22  35 1 3  1  1  2  0.2 --                                                                              --                                                                              --                                                                              --                                                                              3 REMAINDER                                                                              95    10     0.05                 23  25 2 2.5                                                                              1.5                                                                              1  0.5                                                                              0.3 --                                                                              --                                                                              5 1 --                                                                              REMAINDER                                                                             100     8     0.06                 24  20 1.5                                                                             3  1.5                                                                              -- 2.5                                                                              0.2 1 1 1 0.5                                                                             --                                                                              REMAINDER                                                                              95    11     0.06                 25  25 3 4  2.5                                                                              -- 1  0.5 4 --                                                                              --                                                                              --                                                                              0.5                                                                             REMAINDER                                                                             105    10     0.07                 26  20 2 1  1  0.5                                                                              0.5                                                                              0.7 --                                                                              2 1 --                                                                              2 REMAINDER                                                                             100     8     0.07                 27  30 2.5                                                                             0.5                                                                              2  1  1.5                                                                              0.4 --                                                                              --                                                                              --                                                                              2 1 REMAINDER                                                                             110     9     0.06                 28  35 1.5                                                                             2.5                                                                              1  -- 1  0.4 --                                                                              0.1                                                                             --                                                                              0.5                                                                             0.5                                                                             REMAINDER                                                                             105    13     0.06                 29  30 1 3.5                                                                              1.5                                                                              -- 2  0.8 0.5                                                                             --                                                                              1 1 1 REMAINDER                                                                             100     9     0.07                 30  30 1.5                                                                             4  2  0.2                                                                              1.5                                                                              0.4 1 2 0.5                                                                             4 1 REMAINDER                                                                             110     6     0.06                 COMPARATIVE Cu-BASED SIN ALLOY                                                 1   7*                                                                              3 2  1  1  1  0.3 --                                                                              --                                                                              --                                                                              --                                                                              --                                                                              REMAINDER                                                                              45    78     0.03                  2  25 2.5                                                                             --*                                                                              3  1  2  0.4 --                                                                              --                                                                              --                                                                              --                                                                              --                                                                              REMAINDER                                                                              90    45     0.05                  3  30 2.5                                                                             1  --*                                                                              1  -- 0.3 --                                                                              --                                                                              --                                                                              --                                                                              --                                                                              REMAINDER                                                                              90    47     0.05                  4  25 2 2  1  --*                                                                              --*                                                                              0.4 --                                                                              --                                                                              --                                                                              --                                                                              --                                                                              REMAINDER                                                                             105    49     0.06                  5  30 1.5                                                                             1  1  -- 2  0.01*                                                                             --                                                                              --                                                                              --                                                                              --                                                                              --                                                                              REMAINDER                                                                              95    86     HEAT                                                                          DAMAGE                6  25 2.5                                                                             2  1  1  1  1.4*                                                                              --                                                                              --                                                                              --                                                                              --                                                                              --                                                                              REMAINDER                                                                              50    28     0.05                 CONVENTIONAL Cu-BASED SINTERED ALLOY                                          28     6 -- -- -- -- --   --                                                                             --                                                                              --                                                                              --                                                                              --                                                                              REMAINDER                                                                              40    95     0.06                 __________________________________________________________________________     (*OUT OF RANGE OF INVENTION)                                             

We claim:
 1. A Cu-based sintered alloy comprising a composition whichcontains on weight basis:Zn in an amount from 10-40%, Al in an amountfrom 03.-6%, oxygen in the form of oxides, in an amount from 0.3-1%; atleast one additional element selected from the group consisting of (a)at least one of Fe, Ni and Co in an amount from 0.1-5%, (b) Mn in anamount from 0.1-5%, (c) Si in an amount from 0.1-3% and (d) at least oneof W and Mo in an amount from 0.1-3%; and the remaining consisting of Cuand inevitable impurities; said alloy having a structure in the matrixof which the oxides are distributed with a granule size ranging from 1to 40 μm, said intermetallic compounds being distributed with a granularsize from 1 to 25 μm.
 2. The alloy of claim 1 having a structure in thematrix of which the oxides comprise 0.5-15% of the surface area ratio,said intermetallic compounds being uniformly dispersed and comprising1-10% of the surface area ratio.
 3. The Cu-based sintered alloy asclaimed in claim 1, wherein said additional element is 0.5-5 weight % ofat least one selected from the group consisting of Fe, Ni and Co.
 4. TheCu-based sintered alloy as claimed in claim 3, further comprising 0.1-5weight % Mn.
 5. The Cu-based sintered alloy as claimed in claim 3,further comprising 0.1-5 weight % of at least one element selected fromthe group consisting of W, Mo and Cr.
 6. The Cu-based sintered alloy asclaimed in claim 3, further comprising 0.1-4 weight % Sn.
 7. TheCu-based sintered alloy as claimed in claim 3, further comprising 0.1-5weight % Mn and 0.1-5 weight % of at least one of W, Mo and Cr.
 8. TheCu-based sintered alloy as claimed in claim 3, further comprising 0.1-5weight % Mn and 0.1-4 weight % Sn.
 9. The Cu-based sintered alloy asclaimed in claim 3, further comprising 0.1-4 weight % Sn and 0.1-5weight % of at least one of W, Mo and Cr.
 10. The Cu-based sinteredalloy as claimed in claim 3, further comprising 0.1-5 weight % Mn, 0.1-4weight % Sn and 0.1-5 weight % of at least one element selected from thegroup consisting of W, Mo and Cr.
 11. The Cu-based sintered alloy asclaimed in claim 3, further comprising 0.1-3 weight % Si and 0.1-3weight % of at least one element selected from the group consisting of Wand Mo.
 12. The Cu-based sintered alloy as claimed in claim 3, furthercomprising 0.1-3 weight % Si, 0.1-4 weight % Sn, and 0.1-3 weight % ofat least one of W and Mo.
 13. The Cu-based sintered alloy as claimed inclaim 3, further comprising 0.1-3 weight % Si, 0.1-3 weight % Cr and0.1-3 weight % of at least one of W and Mo.
 14. The Cu-based sinteredalloy as claimed in claim 3, further comprising 0.1-3 weight % Si, 0.1-4weight % Sn, 0.1-3 weight % and 0.1-3 weight % of at least one of W andMo.
 15. The Cu-based sintered alloy as claimed in claim 3, furthercomprising 0.1-5 weight % Mn and 0.1-3 weight % Si.
 16. The Cu-basedsintered alloy as claimed in claim 3, further comprising 0.1-5 weight %Mn, 0.1-3 weight % Si and 0.1-3 weight % Cr.
 17. The Cu-based sinteredalloy as claimed in claim 1, wherein said additional elements are 0.1-3weight % Mn, 0.1-3 weight % Si, and 0.1-3 weight % of at least one of Wand Mo.
 18. The Cu-based sintered alloy as claimed in claim 17, furthercomprising 0.1-5 weight % of at least one of Fe, Ni and Co.
 19. TheCu-based sintered alloy as claimed in claim 17, further comprising 0.1-4weight % of Sn.
 20. The Cu-based sintered alloy as claimed in claim 17,further comprising 0.1-3 weight % Cr.
 21. The Cu-based sintered alloy asclaimed in claim 17, further comprising 0.1-4 weight % Sn and 0.1-5weight % of at least one of Fe, Ni and Co.
 22. The Cu-based sinteredalloy as claimed in claim 17, further comprising 0.1-3 weight % Cr and0.1-5 weight % of at least one of Fe, Ni and Co.
 23. The Cu-basedsintered alloy as claimed in claim 17, further comprising 0.1-4 weight %Sn and 0.1-3 weight % Cr.
 24. The Cu-based sintered alloy as claimed inclaim 17, further comprising 0.1-4 weight % Sn, 0.1-3 weight % Cr and0.1-5 weight % of at least one of Fe, Ni and Co.
 25. A part forautomotive equipment formed of the Cu-based sintered alloy as claimed inany one of claims 1 to 24, and which is used in a portion which sufferswear in air within the range of the ordinary temperature to 400° C. 26.A part for automotive equipment as claimed in claim 25, wherein the partis a synchronizer ring for a transmission.
 27. A part for automotiveequipment as claimed in claim 25, wherein the part is a valve-guide foran engine.
 28. A part for automotive equipment as claimed in claim 25,wherein the part is a bearing for a turbo-charger.